
/*
22. Liquid, three columns, hybrid widths (n.22)

要求

wrapper margin-left:-200px为extra留出空间
content margin-left:200px margin-right: 25%为navigation留出空间
navigation 宽度25%，位于content右侧
extra 宽度200px，位于content右侧
*/
#container {
    margin: 0 auto;
}

#wrapper {
    float: left;
    width: 100%;
    margin-left: -200px;
}

#content {
    margin-left: 200px;
    margin-right: 25%;
}

#navigation {
    float: left;
    width: 25%;
    margin-left: -25%;
}

#extra {
    float: left;
    width: 200px;
    /*margin-left: -200px; Error */
}

#footer {
    clear: both;
}